Apparatus for removing oven doors



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* INVENTOR k ATTORNEY Patented Nov. 11, 1924..

STATES PATENT OFFICE.

JULIUS BECKER, OF SYRACUSE, NEW YORK, ASSIGNOR TO SEMET-SOLVAY COMPANY,

OF SOLVAY, NEW YORK, A CORPORATION OF NEW YORK.

APPARATUS FOR REMOVING O'VEN DOORS.

Application filed December 8, 1921. Serial No. 521,064.

To all whom it may concern:

Be it known that I, JULIUS BECKER, a citizen of the United States, residing at Syracuse, in the county of Onondaga and State of New York, have invented a new and Improved Apparatus for Removing Oven Doors, of which the following is a specification.

My invention relates particularly to means for removing and setting in place the doors of retort coke ovens and the object of my improvements is to provide efiicient and convenient means for this purpose which shall be operable with the expenditure of a minimum of power and in such a manner that the removal and resetting of the door shall be effected without loosening or otherwise injuring the door frame.

The invention will be best understood by reference to the accompanying drawings,

' illustrating an embodiment thereof, Fig. 1 of which shows a side view of the device,

Fig. 2, shows a side view on an enlarged scale of the door engaging and lifting mechanism in position to begin the disengaging of the door from its socket, Fig. 3 shows the lifting mechanism withdrawn from the door, Fig. 4 shows a plan view of the device, Fig. 5 shows a front elevation of the same, Fig. 6 shows a vertical section on the line 66, Fig. 4, Fig. 7 is an enlarged view partly in section of the unlatching rod and gears and Fig. 8 is a side view of a 'modified form of the device.

Referring to the drawings, 1, indicates a carriage, mounted upon wheels, 2, 2, which are ada ted to run on track, .5, 3, along in front of a battery of ovens so that the apparatus may be shifted from place to place as required along the face of the battery so as to engage the several doors.

Upon the carriage, 1, is mounted a ram, 4, carried on wheels 5, 5, 5, which is inclin'ed slightly downward toward the ovens and is provided with a head, 4, to which is secured the door engaging mechanism. The ram, 4, is arranged to be moved toward or from the oven doors by means of a motor 6, gear train, 7 and pinion, 8, which engages with a rack, 9, carried on the ram, 4. The rack, 9, is held in place by guides, 10, 10, and is movably independently of the movement of the ram, 4, but in the same direction, Within fix d by the engagement of stops, 11, 11, with lugs, 12, 12. Between the stops 11, 11 is located shock absorbing spring, 13. Connected at one end to rack,

9, by push rod, 14, and link, 15, is thrust lever, 16, which is pivotally mounted on ram, 4, by pin, 17 and is connected at the other end by pin, 18, to thrust arms, 19, 19. These thrust arms, 19, are suspended by links 20, 20, from pin 21 and carry thrust rollers, 22, 22, which bear upon the door frame when the lifting mechanism is in position for operation. Thrust lever 16,

is further, connected to ram, 4, by spring and nut 28, which is connected to pin, 48,

which passes through the inner end of arm, 24. The screw, 2!, is revolved by gears, 29, and hand wheel, 30, and is pivotally connected to the ram, 4, by pins 31, 31. The pin, 21, on which the door engaging hook arm, 24", is carried passes through the door lifting arms, 32, 32, which are pivotally mounted on the ram head 4 by pin, 33, and are connected through link, 34, and bent lever, 35, which is pivotally connected to ram 4, to wheels, 36, which are arranged to travel on inclined tracks, 37, carried on the carriage.

Upon rods, 38, 38 which at their upper ends pass through brackets, 39, 39, attached to the door lifting arms 32, and at their lower ends are connected by collars with pins, 40, are carried door unlatching hooks, 41, 41, which are arranged to engage with the door lock bars, 42, 42.

Upon the pin, 40, are carried door holding rollers, 43, 43., which are pushed against the lower portion of door, D, by the action of counter weight, 44, through link 45, and counter-weight lever46, which is pivotally connected to the ram head 4, by pin, 47

The operation of the device is as follows :-The carriage 1, having been properly located in front of the door to be removed the ram, 4, is advanced, by means of motor,

6, the rack, 9, being held from independent movement by the action of spring 23, on lever, 16, and rack, 9, and ram, 4, are moved forward until the thrust rollers, 22, impinge against the door frame the shock of impact being absorbed by spring, 23.

The thrust rollers, 22, and thrust arms, 19, then hold pin, 18, stationary, so that further advancement of the rack, 9, causes the lever, 16, to swing about the pin, 18, as a fulcrum, thus further compressing spring,

23, and retarding the forward movement of the ram, 4 to an extent determined by the inequality in the distance of the connecting pin, 17, from the ends of the thrust lever, 16. Rack, 9, thenmoves forward in its guides, 10, taking with it ram 4 by reason of the spring, 23, and connecting pin, 17, and continues to do so until the door engaging hook, 24, enters socket, 26, in the door, D, as shown in Fig. 1 of the drawings, the shock of impact, being again absorbed by spring, 23. Too great a penetration of socket 26, by hook, 24, is prevented by contact of cheeks, 25, with the outer surface of the door. Meanwhile the door holding rollers, 43, have impinged against the lower portion of the door, D, and thus arrested further forward movement of link, 45. The forward movement of ram, 4, however, has

pushed forward the fulcrum pin, 47 thus causing the counterweight, 44, to be lifted and to hold the rollers, 43, against the door with a pressure determined by the length of the counterweight lever arm, 46, which may be varied to suit the requirements.

The parts are then in position for lifting .the door engaging hook, 24, into engagement with the door socket, 26, and for lifting the latch bars, 42, from engagement with the latch hooks, and the forward movement of ram, 4, and'rack, 9, is stopped.

Hand wheel, 30, is then rotated causing,

arm, 24*, to be moved about pin, 21, as a fulcrum, thus lifting hook, 24, and engaging it firmly with door socket, 26. At the same time through the action of arms, 49,

which are connected to pin, 48, and the connected arms, 50, 51, which latter are en- I I 36, firmly gaged with rods, 38, rods 38 are lifted, thus causing the unlatching hooks, 41, to engage and lift from their sockets the lock bars,

'42, so that the door, D, is ready to be removed from its frame, Further rotation .of wheel, 30, causes adownward pressure on pin, 21, thus taking up any lost motion in arms, 32,34, and 35, and seating wheels,

\ then set 1n operation so as to move pinion,

8, in a clockwise direction, thus retracting rack, 9, and causing arm, 16, torotate on pin,j18, as a fulcrum thus pushing back the ram, 4, through the thrust of pin, 17, and pulllng back the top of the door, D,

through the engagement of the lifting hook,

on their tracks. Motor, 6, is-

time the rack, 9, has moved backward with greater speed than the ram, 4, until lug, 12, has engaged with stop, 11, the shock of impact being absorbed by spring, 13, after which the rack, 9, and ram, 4, move together, and the thrust rollers, 22, no longer engage the door frame.

The door is now removed from its socket by the backward movement ofv the ram and, by reason of the inclination of the ram and also the movement of wheels, inclined tracks, 37, is at the same time lifted vertically until the ram has reached the limit'of its backward movement. As the door begins to rise at the instant of the beginning of its backward movement it makes no contact with the door sill or oven platform as it moves.

In replacing the door the ram is moved forward as before until the bottom of the door, which is held advanced by the counterweight, 44, and rollers, 43, is in place in the door frame. The top of the door is then pushedinto place by door engaging hook, 24. The engagement, at this time, of the thrust rollers, 22, with the door frame causes, as before, rotation of arm, 16, about pin, 18, as a fulcrum and thereby automatically retards the speed of movement of the ram,

means the gradual and slow fitting of the door into place is automatically eifectech Opportunity is thus afforded the operator for any required adjustment and a proper fit of the door into the door frame is secured. By the time the door has been thus fitted into place, lug, 12, has engaged with stop, 11. Thefull forward movement of the rack, 9, is then transmitted to the ram and the door is thereby forced firmly into its position. The door engaging hook is then released from its socket and the latch bars, 42, are dropped into place by rotating the wheel, 30, in the reverse direction.

A diagrammatic side view of a modifica tion of the device is shown in Fig. 8 in 37, not only serves as a guide for the rollers, or wheels, 36. but also supports the wheels,

5, onwhich the ram, 4 travels. Implace of the levers and link 32, 34, 35 are also. sub- 36, in their .door and then removing the door stituted brackets, 35, which are mounted on the ram, 4, by pin, 52, and are .directly attached to the rollers 36. The method of operation is the same as above described.

By my invention means are provided for tilting the top of the door outward before removing it from its socket thus breaking the mudding with a tearing action from the top downward and thus with a much less expenditure of power than when the door is moved directly outward, and the door frame is held in place with a force equal to-that applied inbreaking the door seal, so that no dislodgment of the frame. is possible.

The door may also be lifted from its seat along any desired curve, according to the degree of inclination of the ram, 4, and the track, 37, and the lifting mechanism is en+ gaged with the door and the door is returned to its seat without shock or violent impact, the advantages of which will be readily apparent to" those skilled in the art.

What I 'claim as new and desire to secure by Letters Patent is 1. In an oven door extractor the combination of a carriage, a reciprocating member mounted thereon, door engaging mechanism carried by said member, means for tilting the top of the dooroutward from the door frame and means for applying pressure to the door frame equal to that applied in withdrawing the top of the door from the door frame.

2. In an oven door extractor the combina-v tion of a carriage, a reciprocating member mounted thereon, a rack carried by said member whereby reciprocating movement is imparted thereto and arranged to have movement independent of said member and means actuated by the movement of said ram for first tilting outward the to of the om its frame and means actuated by the movement of said rack for holding the door, frame in I place during said tilting movement.

3. In an oven door extractor the combination of door engaging mechanism, means for tilting the to of the door outward from its frame an means for applying pressure to the door frame during such tilting. movement.

4. In an oven door extractor the combination of alreciprocating member arranged to move along an inclined path upwardly from the oven, door engagin means carried by said member and means w ereby the door 1s first tilted outward from position and along an upward, sloping path by the backward movement of said reciprocating member.

tion of a reciprocating member arranged to move along an inclined path upwardly from the top and: then removed from its framein its tilted frame. 5. In an oven door extractor the combinaa;

to be moved forward into engagement with the door, arms connected with the reciprocating member and arranged to engage with and apply pressure to the door frame and means actuated by the engagement of said arms with the door frame to decrease the rate of forward movement of the door engagin means.

7. Iii 1 an oven door extractor the combination of a reciprocating member comprising a rack and a ram movable thereby and arranged to have movement independent thereof, door engaging means carried by the ram, a member connected with the rack and arranged to engage with and apply pressure to the door frame and means actuated by the engagement of said member with the door frame to decrease the rate of movement of the ram relative to the rack. v

8. In an oven .door extractor the combination of a reciprocating member, door engagingmeans carried by said member, arms arranged to contact with the door frame while the door is being removed from and fitted into its frame and means actuated by contact of said arms with the door frame 10. In an oven door extractor the com-.

bination of means for breaking the seal of the door from the top downward, means for i applying pressure to the doorframe dur-.

mg the breaking of the seal, means for removing the door from its frame and returning it" thereto and means actuated by said pressure applying means for reducing the rate of forward-movement of the door before it comes into re-engagement with its 11. In an oven door extractor the combination of a motor, means actuated by the motor for withdrawing. the door-from and returning it to place in its frame and meansfor automatically retarding the speed at which the door is returned to place in the door frame before it makes contact with the frame.

13. In an oven door extractor the combination of a motor, door engagin means, means actuated by the motor for ringing said door engaging means into position for engaging the door and means for retarding the speed at which said-door engaging means is brought into position for engaging the door before it makes engagement door andv independently of the speed of the motor. I

14. In an oven door extractor the combination of a motor, door engaging-means, means actuated by the motor for advancing said door engaging means into position for engaging the door and means for automatically retarding the speed at which said door engaging means is advanced into positlon for engaging the door before it makes engagement with the door.

n ture, this 25th day of November, 1921.

JULIUS BECKER.

testimony whereof I aflix my signa- 20 with the 

